DHCP Server

Layer 3 Management > DHCP Server > Basic Settings

• DHCP Server—select the DHCP server status in the router. The default option is Disabled. The list contains:
  • Enabled—enables the DHCP server in the router and starts serving the server with the IP addresses. It opens the UDP socket and starts listening for DHCP discover messages from clients.
  • Disabled—disables the DHCP server in the router.
  Note:

  The DHCP server can be set as Enabled, only if the DHCP Relay is set as Disabled using Layer 3 Management > DHCP Relay > Basic Settings > DHCP Relay Basic Settings screen.

• Blocked IP Address Re-Use Timer (secs)—enter the reuse timeout value used by DHCP in seconds. It denotes the amount of time the DHCP server entity waits for a DHCP REQUEST from a client, before reusing the offer (i.e. the blocked IP address). An value zero disables this timer. This value ranges from 1 to 120 seconds. The default value is 5 seconds.
• ICMP Echo—select the status of ICMP (Internet Control Message Protocol) Echo feature for the DHCP server. This object controls the server to probe for the IP address before allocating the IP address to a client through the ICMP echo message. The default option is Disabled. The list contains:

• ICMP Echo—the list contains (cont.):
  • Enabled—enables the ICMP Echo feature. Before allocating an IP Address to client, the server broadcasts ICMP Echo Request (Ping Packet) to check whether any other machine/host is using this IP. If there is no response received, the server allocates the IP to the client.
  • Disabled—disables the ICMP Echo feature. The ICMP Echo Request packet mechanism is not used. The IP is directly allocated to the client.
• DHCP Next Server—select the IP address of the boot server (TFTP server) from which the initial boot file is to be loaded in a DHCP client. This boot server acts as a secondary server. The default address is 0.0.0.0 (No boot server is defined). The DHCP server is used as a boot server.

• Apply—modifies attributes and saves the changes.

Layer 3 Management > DHCP Server > Pool Settings

• Select—click to choose a Pool ID for which the configuration needs to be modified or deleted.
• Pool ID—enter the Pool ID. This is an unique index for any subnet pool. This value ranges from 1 to 2147483647.
• Pool Name—enter the pool name to identify the subnet pool. This is a string of maximum size 64.
• Subnet Pool—enter the subnet of the IP address in the pool.
• Network Mask—enter the Network Mask. It denotes the client’s subnet mask of the IP address in the pool.
• Start IP Address—enter the first IP address in the address pool that is used for dynamic allocation by the DHCP server. This specifies the lower limit for IP address in an address pool.
  Note:

  Start IP Address should have same network of the subnet pools.

• End IP Address—enter the last IP address in the address pool that is used for dynamic allocation by the DHCP server. This specifies the upper limit for IP address in an address pool.
  Note:

  Start IP Address should have same network of the subnet pools.

• Lease Time (Secs)—enter the time interval for which the IP address is valid. This specifies the amount of time that the client can use the IP address assigned by the server and is specific to each IP address pool. Every IP address allocated from a pool will be returned to the pool if the client does not renew it. This value ranges from 60 to 2147483647 seconds. The default value is 3600.
• Utilization threshold / Threshold—enter the DHCP pool utilization threshold value in percentage. This specifies the upper limit for the address pool utilization, after which a notification will be sent to SNMP Manager. This value ranges from 0 to 100 in percentage. The default value is 75.
• Status—select the status of the entry. It denotes the status of address pool configuration and allocation of IP address. Options are.
  • UP—configures the address pool successfully for allocating IP address.
  • Down—does not configure address pool for allocating IP address

• Create—adds and saves new configuration.
• Reset—resets to default value for respective fields and discards all user input.
• Apply—modifies attributes and saves the changes.
• Delete—deletes the selected entry.

Layer 3 Management > DHCP Server > Pool Options

• Select—click to choose a Pool Name for the configuration to be modified/deleted.
• Pool Name—select a Pool Name from the list of Address Pools created in the system for which DHCP Pool Options a configuration needs to be applied.
  Note:

  This field lists the pool names created in DHCP Pool settings screen

• Option / Option Name—select the DHCP pool option to be set to the selected pool name. The default option is NetMask (IP Format).
  Note:

  Refer Appendix A for the items in the list and their description

• Option Code—displays the corresponding DHCP Option Code for the DHCP option selected in the field Option. The Option Code represents a specific DHCP option used in a DHCP OFFER message in response to a DHCP DISCOVER message. The default is 1 - the default Netmask (IP Format).
  Note:

  Refer Appendix A for the items in the list and their description.

  This field is configurable if the option is selected as “Enter Option Code Manually”

• Option Value—enter the value to be set for the DHCP option selected in the field Option. This value can be an ASCII string, hexadecimal string or unicast IP address based on the DHCP pool option.
• Option Value 2—enter the value to be set for the DHCP option selected in the field Option. This value can be an ASCII string, hexadecimal string or unicast IP address based on the DHCP pool option.

• ADD—adds and saves new configuration.
• Reset—resets to default value for respective fields and discards all user input.
• Apply—modifies attributes and saves the changes.
• Delete—deletes the selected entry.

Layer 3 Management > DHCP Server > Exclude List

• Select—click to choose a Pool ID for the configuration to be reapplied.
• Pool ID—click to select Pool ID for which the configuration needs to be re-applied.
  Note:

  Pool ID should be created using the DHCP Pool Settings screen prior to configuring the exclude list.

• Start IP address—enter the start IP address for the Exclude List. This address denotes the first IP address of a range of IP addresses which needs to be excluded from the created subnet pool.
  Note:

  This IP address should be:

  • lower than the end IP address of the Exclude List, and
  • In the same network of the subnet pool start IP address.
• End IP address—enter the end IP address for the Exclude List. This address denotes the first IP address of a range of IP addresses which needs to be excluded from the created subnet pool.
  Note:

  This IP address should be:

  • higher than the end IP address of the Exclude List, and
  • In the same network of the subnet pool start IP address.

• Add—adds and saves new configuration.
• Reset—resets to default value for respective fields and discards all user input.
• Apply—modifies attributes and saves the changes.
• Delete—deletes the selected entry.

Layer 3 Management > DHCP Server > Host Settings

• Select—click to choose a Pool ID for the configuration to be reapplied.
• Host MAC Address—enter the unicast MAC address for configuring the DHCP host.
• Pool Name—select a Pool Name from the list of Address Pools created in the system for which DHCP host IP related configuration needs to be applied.
  Note:

  This field lists the pool names created in DHCP Pool settings (Layer 3 Management > DHCP Server > Pool Settings) screen.

• Host IP—enter the IP address for configuring of the DHCP host.

• Add—adds and saves new configuration.
• Reset—resets to default value for respective fields and discards all user input.
• Apply—modifies attributes and saves the changes.
• Delete—deletes the selected entry.

Layer 3 Management > DHCP Server > Host Options

• Select—click to select Host MAC address for which the configuration is re-applied.
• Host MAC Address—enter Unicast MAC address for configuring the DHCP host.
• Pool Name—select a Pool Name from the list for which DHCP host IP related configuration needs to be applied.
  Note:

  Refer to Appendix A for the items in the list and their descriptions.

• Option Code—displays the corresponding DHCP option code for the DHCP option selected in the field option. The option code represents that represents a specific DHCP option used in a DHCP OFFER message in response to a DHCP DISCOVER message. The default is 1 (the code for the default option—Netmask (IP Format).
  Note: Refer to Appendix A for details about option code and its corresponding DHCP option.This field is configurable if the option is selected as “Enter Option Code Manually”.
• Option Value—enter the value to be set for the DHCP option selected in the field option. This value can be an ASCII string, hexadecimal string, or unicast IP address based on the DHCP pool option.
• Option Value 2—enter the value to be set for the specified DHCP option. This value can be an ASCII string, hexadecimal string, or unicast IP address based on the DHCP pool option.
  Note: This field is enabled only when the Option/Option Name is set as Network Time Protocol server (IP Format), SIP Server IP Format and SIP Server Domain name.

• Add—adds and saves new configuration.
• Reset—resets to default value for respective fields and discards all user input.
• Apply—modifies attributes and saves the changes.
• Delete—deletes the selected entry.

Layer 3 Management > DHCP Server > Bootfile Configuration

• Enter the bootfile name—enter the name of the initial boot file to be loaded in a DHCP client. This value is a string of maximum size 64. The boot file contains the boot image that is used as the operating system for the DHCP client.
  Note:

  Only characters and numbers are accepted in the bootfile name string.

• Apply—modifies attributes and saves the changes.
• Reset—resets to default value for respective fields and discards all user input.